feat(OpenGL): lab1

OpenGL/lab1/src/main.cpp

@@ -2,39 +2,6 @@
 #include <GLFW/glfw3.h>
 #include <iostream>
 
-// 三角形顶点
-float vertices[] = {
-    // 第一个三角形
-    0.5f, 0.5f, 0.0f,   // 右上角
-    0.5f, -0.5f, 0.0f,  // 右下角
-    -0.5f, -0.5f, 0.0f, // 左下角
-    -0.5f, 0.5f, 0.0f   // 左上角
-};
-
-// 索引
-unsigned int indices[] = {
-    0, 1, 3, // 第一个三角形
-    1, 2, 3  // 第二个三角形
-};
-
-// 顶点着色器源码
-const char *vertexShaderSource =
-    "#version 330 core\n"
-    "layout (location = 0) in vec3 aPos;\n"
-    "void main()\n"
-    "{\n"
-    "   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
-    "}\0";
-
-// 片段着色器源码
-const char *fragmentShaderSource =
-    "#version 330 core\n"
-    "out vec4 FragColor;\n"
-    "void main()\n"
-    "{\n"
-    "   FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
-    "}\n\0";
-
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
 void processInput(GLFWwindow *window);
 
@@ -42,14 +9,16 @@ void processInput(GLFWwindow *window);
 const unsigned int SCR_WIDTH = 800;
 const unsigned int SCR_HEIGHT = 600;
 
-int main() {
+int main(int argc, char **argv) {
 
   // 设置 glfw
   glfwInit();
+  // 设置 OpenGL 版本为 3.3
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
-  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
-  // glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+  // 设置 OpenGL 管线为兼容模式
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
 
   // 创建窗口
   GLFWwindow *window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
@@ -69,87 +38,6 @@ int main() {
   // 设置视口
   glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 
-  // 创建顶点着色器
-  unsigned int vertexShader;
-  vertexShader = glCreateShader(GL_VERTEX_SHADER);
-  // 将着色器源码附加到着色器对象上
-  glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
-  // 编译着色器
-  glCompileShader(vertexShader);
-  // 检查编译是否成功
-  int success;
-  char infoLog[512];
-  glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
-  if (!success) {
-    // 获取错误信息
-    glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
-    std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n"
-              << infoLog << std::endl;
-  }
-
-  // 创建片段着色器
-  unsigned int fragmentShader;
-  fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
-  // 将着色器源码附加到着色器对象上
-  glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
-  // 编译着色器
-  glCompileShader(fragmentShader);
-  // 检查编译是否成功
-  glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
-  if (!success) {
-    // 获取错误信息
-    glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
-    std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n"
-              << infoLog << std::endl;
-  }
-
-  // 创建着色器程序
-  unsigned int shaderProgram;
-  shaderProgram = glCreateProgram();
-  // 将着色器附加到程序上
-  glAttachShader(shaderProgram, vertexShader);
-  glAttachShader(shaderProgram, fragmentShader);
-  // 链接程序
-  glLinkProgram(shaderProgram);
-  // 检查链接是否成功
-  glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
-  if (!success) {
-    // 获取错误信息
-    glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
-    std::cout << "ERROR::SHADER::PROGRAM::LINK_FAILED\n"
-              << infoLog << std::endl;
-  }
-
-  // 删除着色器
-  glDeleteShader(vertexShader);
-  glDeleteShader(fragmentShader);
-
-  // 创建顶点数组对象
-  unsigned int VAO;
-  glGenVertexArrays(1, &VAO);
-  glBindVertexArray(VAO);
-
-  // 创建顶点缓冲对象
-  unsigned int VBO;
-  glGenBuffers(1, &VBO);
-
-  // 将顶点数据复制到缓冲中
-  glBindBuffer(GL_ARRAY_BUFFER, VBO);
-  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-
-  // 创建索引缓冲对象
-  unsigned int EBO;
-  glGenBuffers(1, &EBO);
-
-  // 将索引数据复制到缓冲中
-  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
-  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices,
-               GL_STATIC_DRAW);
-
-  // 设置顶点数据解析方式
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
-  glEnableVertexAttribArray(0);
-
   // 循环渲染
   while (!glfwWindowShouldClose(window)) {
     // 处理输入
@@ -159,16 +47,48 @@ int main() {
     glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    // 绘制三角形, 激活程序
-    glUseProgram(shaderProgram);
-    glBindVertexArray(VAO);
     //使用线框模式绘制
     glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
     // 设置线宽
-    glLineWidth(5.0f);
+    glLineWidth(3.0f);
-    // 绘制
+    // 设置为 Gouraud 着色模式
-    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glShadeModel(GL_SMOOTH);
-    glBindVertexArray(0);
+    // 绘制三角形
+    glBegin(GL_TRIANGLES);
+    glColor3f(1.0f, 0.0f, 0.0f); // 红色
+    glVertex2f(-0.4f, -0.4f);
+    glColor3f(0.0f, 1.0f, 0.0f); // 绿色
+    glVertex2f(0.4f, -0.4f);
+    glColor3f(0.0f, 0.0f, 1.0f); // 蓝色
+    glVertex2f(-0.4f, 0.4f);
+
+    glColor3f(0.0f, 1.0f, 0.0f); // 绿色
+    glVertex2f(0.4f, -0.4f);
+    glColor3f(0.0f, 0.0f, 1.0f); // 蓝色
+    glVertex2f(-0.4f, 0.4f);
+    glColor3f(0.0f, 0.0f, 0.0f); // 黑色
+    glVertex2f(0.4f, 0.4f);
+    glEnd();
+
+   //使用面模式
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+    // 设置为 FLAT 着色模式
+    glShadeModel(GL_FLAT);
+
+    glNewList(1, GL_COMPILE);
+    glBegin(GL_TRIANGLE_FAN);
+    glColor3f(0.0f, 0.0f, 1.0f); // 蓝色
+    glVertex2f(0.5f, 0.5f);
+    glVertex2f(0.5f, 0.7f);
+    glVertex2f(0.7f, 0.5f);
+
+    glVertex2f(0.5f, 0.7f);
+    glVertex2f(0.7f, 0.5f);
+    glVertex2f(0.7f, 0.7f);
+    glEnd();
+    glEndList();
+
+    glCallList(1);
 
     // 检查并调用事件，交换缓冲
     glfwSwapBuffers(window);